Chuck adjusting device



July '1, 1947. H2. A. HAMBERGER CHUCK ADJUSTING DEVIGE` Filed sept. 12. 1944` 5 shees-sheet 1 :Snventor July 1, 1.947D H. A.v HAMBERGER 2,423,312

l CHUCK ADJUSTING DEVICE `vFiled sept. 12. 1944 s sheets-sheet 2 nventor July 1, 1947.

H. A. HAMBERGER 2,423,312 CHUCK ADJusTmGi DEVICE ,y Filed sept.` 12, 1944 s sheets-sheet 5 :Snventor Patented July 1, 1947 UNITED STTEES PATENT OFFICE 'CHUCK ADJUSTINGIV Henry AQiHa-mberger; RohestenN. Y. Applioationiseptember 12, 1944, Ser'ial'No.- 553,788

(crave-aci 4" Claims. .1 ,Thegpresent `inventionrelates, in general, to a methodandfmeans,. for effecting precise adjustments in machine tools and the like, and has -more particular reference 4to a method, fand means; for simply,` quickly, Vand accurately, precisely adjusting work piece'holding devices such .as chucks oniathes, and like machinetools.

Inoperating machine tools, such aslathes, and performing. precise operations on workY pieces, it Ais essential that the work `pieceloe accurately centered on the `axis of rotation of the `lathe spindle. Tothis end` in View, chucksmay be employed, that `areof the non-universal type, and in Whichthegripping'jaws are separately adjustable. With suchchucks, it. is -a lengthy and skillfuloperation, of trialand error, to accurately center a work piece. Y

rWith ...a universal chuckgin which `the'gripping `jaws -are mechanically `controlled to move together,A much timeis saved, but only at the expense of accuracy. Such chucks, even when new, Yare not extremely accurate,and after some use,

are much-too inaccurate for precise work. Fur- Qtherrriore, if accurate for one sizeof workpiece jthey'lare more .than likelyvtobe inaccurate for other sizes of workpieces, It isroflcourse, possible, `to center the work 'piece 'by takingia more 'or less Ideepfcut thereon?. ,"But this is wasteful of`time and material,` and, in the case of cylin- "drical bar stock that is 'accurately cylindrical and highly polished, a subsequentpolishing'oper- 1 ation must'be performed.

"With theV above, and other considerations in mind, it is proposed, "in accordance with the .'presjent invention; to provide a method and means fori'quickly centering la'work piece gripped in a 'universa1 chuck, by jbodily moving the chuck head on 'its-carryingflange, whereby the chuck will thereafter accurately center all stock of exactly the vsame size, -regardless `of inaccuracies otherwise in the chuck. This isparticularly advantageousvvhen a. largenumber .of pieces of the lishe'd cylindrical bar-stock, are toy be machined in succession.

loosened The ring movement isin accordance F.with agraduatedscale on one of vthe rings, and

the'extentoffmovement is inaccordance with a direct :reading .from ,--a usual Veccentricity dial sauge..

'viewed in the uireenon of the 4,Further objects, 'purposesV and characteristic features, of' this"`invention, will 'appear as the description "progresses, reference fbeing "made to the accompanyingdrawing, showing, in a'wholly 'diagranmatio"manner, and inno Way in alimiting sense Tone form which the invention can assume'. In' the drawings:

; one lof theoperative phasesjof the invention.

AFig. 9 is' a"`whol1y diagrammatic showing of' a second 'operative'phase of the invention.

Ain mind; has

Referring now to the drawings, arrd'rst'to Figi 1, there isithere shown, in fragmentary form,

partsofaf metalworking lathe; equipped with one form' of the present invention. The -lathe *has -a frame ll),j inwhichff'rotatesA afspindlel l l; threaded flange r-l 3. vTheflange,fand this @should be bor-ne *periphery Il4,'5w`hi'ch -is concentric "witnthe air "'firotationi-Af the lathe spindle which carries the@ hangefand adjustable thereon,

togetherelby a wrench receiving `|Y8,ishown asi-n the form fof waccurately formed -an'd `polished' cylindrical bar lAsclea'rly shoWn-l-in-*the drawings, thechuck f-head'jseadjustabiy heidV to thelnange, by bolts-as y2|,pass`in`g through enlarge'dholes v22, inthe ange ,and received in `threaded openings, as "23, in' the chuck" head. "Beneath the:V bolt heads,

tare ,springwas'hei-S, asiz'd, and a` continuous annular holdingiringj.

. The holding'ring '25 operatestoretain in' positionanannularring 26,'whichserves as a'bearin'gforal'pinion' `stem`j`28,` with pinions 29 and 30 Wrenchfmeanasuchasa square holerecessed fintothe vheader the pinionstemL2s,-is provided for rotating the :stein and! the pinions.

The v.piiions 429 -an'd 3l] engage, respectively,

aeasia with teeth of sectors 3l and 32, which sectors are held in place on respective outer and inner adjusting rings A and B, by screws, or the like 34.

These rings A and B, are received between the concentric flange periphery I4, and the circular, and, as shown in Fig. l, concentric face 20 of flange I9. The rings are L shaped in section, the ring A having an outer face 33, and the ring B an inner face 34, which are accurately circular, and, in the positions shown in Fig. 1,'are concentric with the axis of rotation of spindle II.

The two rings A and B are in contact, throughout 360, with each other, at their inner faces, at

35, and these faces meet, as clearly shown in Fig. 4, on a circle that is eccentric to the axis of rotation of the spindle.

In this Fig. 4, can be clearly seen, the two adjusting rings, the degree of eccentricity of circle 35 being much exaggerated, in the drawing, in order to facilitate an understanding of the invention. The faces 33 and 34 are shown as concentric with the axis of rotation 36 of the spindle, when the rings are so positioned as to cause their eccentricities to oiset each other. As shown, the eccentricity axes of both A and B lie on the line 38, or, in vother words, the widest and the narrowest, parts, of each ring,` lie on line 38. ThisA condition exists when a zero mark on 'the scale S on ring A, is opposite a mark Yon the pinion ring .26. The pinions 29 and 30'are so designed as to move therings, simultaneously, in opposite directions', at exactly vthe same rate. Thus, to position the two rings to have their eccentricities on the same axis, it is merely necessary to operate the pinion shaft 28, by means of a suitable tool, unti1 the zero marks on ring A and pinion ring 26, are accurately in registry.

Carried on thelathe frame is a fixed pointer 39, positioned with its point 40 adjacent ring 26, and in a'ver'tical plane passing through the axis of rotation of `spindle II.

-With the ringsA and B relatively adjusted, by means ofv pinion shaftr28, if it be desired to place the common eccentricity axis of the rings in a horizontal plane, (as in Fig.` 4), it is merely necessary to loosen the holding bolts 2l, to a slight degree, and then, as by means of a spanner wrench, move the pinion ring, pinions, and rings A and B, to position the zero marks accurately in registry with theframe pointer 39.

It can be readily appreciated from whathas been said above, and from aconsideration of Fig. 4,- just how the rings A and B can beroperated to adjust Va work piece held inthe chuck jaws. TheY two rings A and B are supported on the concentric flange face I4, and the chuck head I5 is supported on thetwo rings, by means of its concentric face 20, It is obvious that-by moving the rings relatively to eachothena camming action is exerted on the chuck head and it can be moved relatively to its supporting flange, assuming, of course, that bolts 23 have been just slightly loosened. y

With the parts positioned as shown in'Fig. 4, if the pinion shaft 28 bev rotated counterclockwise, ring A turns counterclockwise, and ring B, clockwise, exactly the same angular distance, Movement of ring Amoves the head, with respect to the ilange,`and of course to the axis of rotation of the lathe spindle vertically downwardly, and horizontally to the left. Ring B, however, moves the head. vertically downwardly and horizontally to the right. Thus -the sidewise movements, in the horizontal directions, offset each other, and the net result is that the work piece is moved down- 4 wardly and directly in line with the fixed pointer head 40.

Accordingly, as appears from the above, if a cylindrical work piece, as I8, held in the jaws I6 of the chuck, is eccentric to the aXis of rotation of spindle II, and is positioned to have its high point accurately positioned at the top, in line with pointer head 40 and rings A and B, and pinion ring 26 be positioned as shown in Fig. 2; and the amount of eccentricity be known, it is a very simple matter to shift the chuck head on the ange so as to accurately center the work piece. To

thus measure the eccentricity, and thus position the work piece, a usual eccentricity dial gauge, 42, is employed.

As shown in Fig. 1, the gauge can be carried by a support 43, resting on the lathe bed, by means of a rod 44, slidably carrying a bracket 45, adjustable on the rod as by a screw 46. The gauge has a dial with graduations 49, readable, for example in thousandths of inches, and includes a pointer 48 and an operating plunger 49. The gauge reads 0 when the plunger is free.

One method for using the gauge is illustrated in Figs. 5-7 as follows: The work piece I8, clamped in the chuck jaws, is shown as being eccentric to the axis of rotation of the spindle, the center of the stock, at 50, lying to the right of the center of rotation, CR, of the spindle.

The gauge is applied to the work piece, as the chuck is slowly rotated, and the gauge reading retained at 0, by adjusting the gauge position, meanwhile retaining the plunger 49 in contact with the work piece, until a position is reached, as in Fig. 6. In this position, with the gauge held stationary, any movement of the work piece, in either direction causes a deflection of the pointer. It is then known that the work piece is accurately positioned with its low point on top and 'in line with the pointer head 40.

' The gauge is then held in xed position, and the work piece rotated to the position to give the maximum reading, as at Fig. '7, of 200, i. e. .200. It is then known that the high point of the work piece is on top, and in line with the pointer head 40, and that double the eccentricity, is equal to .200, since the gauge reads twice the eccentricity, which, of course, is twice the necessary adjustment required to accurately center the work piece.

The scale S, on the outer ring A, is graduated, to read in thousandths of inches and opposite each angular distance of movement necessary for one ring to move the work piece vertically downwardly, a given number of thousandths of inches, is placed the number equal to four times this given number. More specifically, the distance on ringA scale S, labelled 200 is the distance ring A must be moved from its 0 position to effect an adjustment of 50 thousandths of an inch (.050), vertically downwardly, of the work piece. Since the effects Yof the two rings A and B, are additive and equal, in this direction, movement of ring A from 0 to 200, produces an adjustment of two times one quarter of .200", or .100. Thus, with a dial reading of`200equal to 200", the eccentricity is .100, and by moving ring A to read the same as the gauge reading, the work piece is accurately centered on the axis of rotation of the lathe spindle.

To illustrate the invention on drawings of not too large a size, the gure ofl .200, etc., given above, is at least ten to twenty times as large as would ordinarily be met with, in practice. v

The procedure, thus, of accurately centering a t: posti theWorkd piece i tioned,"` as described-salame; With"-its\=hlg` i on topfand 1vdirectly incline --with pointer iheadiitllsl The-*holding bolt-sill; are thenlslight-ly loosenedi andx by means orf-the dirierenti-ali pinions@Naud1V aufV the? o one scala si isbrougntgmw #registi-y-` With th`e "0i f onf-the-pinion-rigj andfiby of absualmspanner Wrenchgforftellike therri-ngsf areall=turned-tdbring theflO-i'marks into registry with pointer head. 40.- Thiscondition is shown in Fig. 8. Allthat is now` required, is to turn the pinions untill the. gauge-reading.. of, 1.200! on l5 i.

scale S, is brought into registryiwitlrithefWO mark on thepinion` ring. Thenthe holding bolts 2l are tightened, and it is assured that the Work pieceali and all other wor-k pieces of thesame.

sizeg'will bevaccurately.centeredglwith theutmost 2012 F Fig. 95@ Withtheadjustment;:zcompleted,` it can be seen Lthat the eccentricity .-of .lOOFThas been accuratelyeliminated. Theaxes of eccentricities of ring A and B, which in Fig. 8 both 25;:

means l 10 i piece -50 lies on the center of rotation, CR, of 30 the lathe spindle.

When a different size of bar stock is to be used, it is merely necessary to make another simple adjustment, as described above.

The scale S, on ring A, is not graduated uniformly but varies in accordance with a sine curve, which sine curve Varies with the degree of eccentricity of the rings A and B.

As set forth above, the eccentricity has been greatly exaggerated, in the drawings. While, in practice, it can vary widely, in accordance with requirements, in one case, in actual practice, with rings having inner and outer diameters of about 6", the degree of eccentricity used is .060", i. e., about 1%. Also, the sectors 3l and 32, While in this case, are such as to cover about 45 of movement, can be varied Widely, in cases so requiring, With such proportions, each ring, moving 45, can correct for 1/2 the eccentricity, and thus both rings can adjust for the total eccentricity, or .060 and so cancare for a dial gauge reading of .120.

In the above description, reference has been made to vertical and horizontal planes, lines, and axes, but the invention is in no Way limited by such terminology. It is merely necessary that the relative positions of the various parts, be as described, .and quite regardless of the orientation of the system, as a Whole.

The above rather specific description of one form of the present invention is given solely for the purpose of illustration, and in no manner in a limiting sense. It is to be clearly understood, that various modifications, alterations, and adaptations, can be made, from time to time, as may be dictated by conditions and requirements, Without departing from the spirit or scope of this invention, except insofar as limited by the scope of the appended claims. K

Having described my invention, I now claim:

wl. In an adjusting means for lathe chucks and the like, in combination; a driven spindle; a chuck flange fixed to the spindle, the periphery of the flange being concentric with the rotation axis of the spindle, an adjustable inner ring mem..

.at the same angular rate, to thereby 6F. ber4 ifrotatively: mounted onstherconcentric ciiuckc flange andflhavingcameccentrica:outeriperipherysc: anW Voutera:` :adjustables` rings membera 'rotatively mountedson the ieccentriczperiphery oithenneri ring;member-,ivandlwith its; outerzperiphery cone.`

centric witrruthe flangefperipheryziwhencthexringe l members-arci adjustedtto. normalgposition.axmie` s versaLchuckl-head.adaptedjtothold a= rotativelyfmountediions the-s outer... ring; members; concentric.:with` the periphery ofathisrringime :.1 ber ;i releasablecmeans for rclampingsthe chucks head ttmth'efflange inavarious: adiustedspositions:s` o'fdzheichuckcheat-12;:` :andfmeansaoperable :to simule-.aV taneouslyrrctatesthe innerfrandcoutenLringfmema bersiiniopp ositexiirections `and at..thesarlmeanali-i` 1 larrratei to itherebyzimparttotthe #chuck-r head randa-.l workrpieceizmovement ofc translatiicm atie rights. angles to the axisniigrotaticn.,` i, .i

2j Inradjusting meanafor lathe :chucks-aandithex like; irracombinationef al.driven'rspindldya hu flanget-xedato .theispindlegj.thetperiphery .otfth nange being, .concentric.1'.With-thedotation;` axis@ the-xfspindletj ansinnemrring rmember, rota-tively@ mounted;A onf: the concentric;1` chuck flange and@ hai/inge an:` eeccentrc; outer, 1: periphery; anc. cute 1 ringimembertrotatiyely; mcuntedtonfthe .eccentr .if periphery, orrthe inneriring .f member f and; with@ its :atouteryperipheryuconcentric .Wfitlifr4 theiange, peripheryfwhenfzthe ,--ringi.membersrareiadiusteda to` normal position; a universal chuck head adapted to hold a Work piece rotatively mounted on the outer ring member and concentric with the periphery of this ring member; releasable means for clamping the chuck head to the flange invarious adjusted positions of the chuck head; a gear section on the inner and on the outer ring members and a pinion member to simultaneously rotate the ring members in opposite directions impart to the chuck head and Work piece movement of translation at right angles to the axis of rotation.

3. In adjusting means for lathe chucks and the like, in combination; a driven spindle, a chuck flange iixed to the spindle, the periphery of the iiange being concentric with the rotation axis of the spindle, an adjustable inner ring member rotatively mounted on the concentric chuck flange and having an eccentric outer periphery, an outer adjustable ring member rotatively mounted on the eccentric periphery of the inner ring member, and having an outer periphery which is eccentric with its inner ring `surface which is resting on the periphery of the inner ring member, a universal chuck head rotatively mounted on the outer ring member and concentric with the outer periphery of this ring member; releasable means for clamping the chuck head to the flange in various adjusted positions of the chuck head; toothed sectors on the rings respectively, a pinion ring, a pinion shaft trunnioned in the pinion ring and pinions on the shaft engaging respectively with the sectors, the pinions being proportioned to turn the outer and inner rings in opposite directions at the same angular rate, a zero mark on the pinion ring, a scale on one adjusting ring running up from a zero mark thereon, a zero mark on the other adjusting ring, the zero mark on the pinion ring being so positioned that when it registers with the zero marks on said adjustable rings, the eccentricities of the adjusting rings are in align ment but opposite to each other, and Wrench receiving means to rotate the pinion ring, pinions 5 and eccentric rings in unison, relative to the means relative toa Work piece in the chuck head.

4. In adjusting means Vfor' lathe chucks and the like, in combination, a driven spindle, a chuck ange xed to the spindle, theperiphery of the flange being concentric withV the rotation axis of the spindle; a universal chuck head; means for clamping the chuck head in various adjusted positions; an adjustable inner ring member rotatively mounted on the concentric chuck ange and having an eccentric outer periphery; an outer adjustable ringmember rotatively mounted on the eccentric periphery of the inner ring ymember and withiits'fouter periphery concentric withl the kiiange t periphery when the ring members are adjusted to normal position; toothed sectors on the ring members respectively, a. pinion ring, arpinion shaft trunnioned in the pinion ring and pinions yon the shaftengaging respectively with the sectors, the pinions beingV proportioned to turn the outer and inner rings in opposite directions at the same angular'rate, a zeroimark on the pinion ring, a scale on one adjusting ring running up from zero, the zero mark on the pinion ring being so positioned that when it registers with the zero mark -on said one adjusting ring, the eccentricities ofVV the adjusting rings lie on the same axis and opposite to each other; a, frame carrying the spindle, a pointer onthe frame terminating adjacent the pinion ring, and wrench receiving means on one of the rings for moving all the rings as a `unit and bringingthe two zeros into registry with` the pointer, the scale on said one adjustment ring having the various distances from its zero marked with values four times as great -as the adjustment of the chuck on the ange at right angles to the common eccentricity axis that is effected lby moving the rings any of said various distances.

HENRY A. HAM'BERGER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 984,000 -Hull Feb. 14, 1911 733,983 Reisner Nov, 1, 1904 826,971 Stowell July 24, 1906 2,088,187 Dempsey July 27, 1937 FOREIGN PATENTS Number Country Date 363,869 Germany 1922 60,084 AustriaJ 1913 460,696 Great Britain Feb. 2, 1937 

